What's the special nature of Russian 2D503B diodes?

[falco_femoralis]

Soviet stuff is insane. It's a miracle what they accomplished with their socio economic situation.

 

[thomasbe86]

Here is the detail of the 100 I measured, not really readable so I took those out (for now) of the master plot:

 

[Boukman]

The Plus uses a pair of 1N4148's in one direction and pair of 2D503B's in the other direction.

View attachment 102208

Hi Robert!!Is there a schematic of the Plus pedal?? What do you think about it??